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Horshack • Forum Pro • Posts: 10,084
More Z8 eye AF discussion and comparisons (part 3)
19 hours ago
6
Continuation of the thread here.
Today I decided to look deeper into the eye AF issues for the 4EV lighting conditions. It occurred to me that perhaps the issue wasn't specific to eye AF or AF-C but simply that the camera's PDAF wasn't sensitive enough for these lighting conditions. To test this theory out I switched to a fixed camera position and added a focus reference to detect if/when the AF was hunting. It's hunting constantly. Then I switched to a higher 6.5EV and confirmed the hunting almost completely disappeared. Then I switched back to 4EV and started experimenting with AF-S and other focus area modes - the camera had significant trouble focusing in AF-S for single point AF over the eye, which to me indicates the root issue here is insufficient PDAF sensitivity at these light levels for this particular subject.
In other words, the eye AF issue I'm showcasing is really a PDAF sensitivity issue. It manifests in eye AF since the size of the PDAF area employed by the subject tracking is a smallish portion of the eye, a portion that AF-S demonstrates focusing trouble with.
Here's the video. The cross-hatch pattern to the left of the mannequin is magnified and split-screen to show when the focus is hunting.
Time jumps:
- 0:00 AF-C 3.5EV
- 0:21 switch to 6.5EV, little to no hunting
- 0:35 switch back to 3.5EV
- 1:24 switch to AF-S, trouble focusing
- 2:06 switch to single-point AF
- 2:25 switch to wide-point AF without subject detection
- 2:35 switch back to single-point AF
- 2:52 switch back to eye-AF auto area
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| Post (hide subjects) | Posted by | When | |
|---|---|---|---|
| More Z8 eye AF discussion and comparisons (part 3) | Horshack | 19 hours ago | 6 |
| Re: More Z8 eye AF discussion and comparisons (part 3) | SCoombs | 19 hours ago | |
| Re: More Z8 eye AF discussion and comparisons (part 3) | Horshack | 19 hours ago | |
| Re: More Z8 eye AF discussion and comparisons (part 3) | Dinosaur dave | 18 hours ago | |
| Re: More Z8 eye AF discussion and comparisons (part 3) | Horshack | 18 hours ago | 1 |
| Re: More Z8 eye AF discussion and comparisons (part 3) | Dinosaur dave | 18 hours ago | |
| Re: More Z8 eye AF discussion and comparisons (part 3) | SCoombs | 18 hours ago | 3 |
| Re: More Z8 eye AF discussion and comparisons (part 3) | Dinosaur dave | 17 hours ago | |
| Re: More Z8 eye AF discussion and comparisons (part 3) | SCoombs | 17 hours ago | 1 |
| Re: More Z8 eye AF discussion and comparisons (part 3) | mosswings | 15 hours ago | |
| Re: More Z8 eye AF discussion and comparisons (part 3) | ray_burnimage | 14 hours ago | |
| Re: More Z8 eye AF discussion and comparisons (part 3) | mosswings | 13 hours ago | |
| Re: More Z8 eye AF discussion and comparisons (part 3) | ray_burnimage | 12 hours ago | |
| Re: More Z8 eye AF discussion and comparisons (part 3) | Donmonte | 18 hours ago | |
| Re: More Z8 eye AF discussion and comparisons (part 3) | aclo | 19 hours ago | |
| Revision to comments in OP | Horshack | 18 hours ago | 1 |
| Re: Revision to comments in OP | SCoombs | 18 hours ago | |
| Re: Revision to comments in OP | mosswings | 12 hours ago | |
| Re: Revision to comments in OP | ray_burnimage | 12 hours ago | 2 |
| Re: Revision to comments in OP | Horshack | 12 hours ago | 1 |
| Re: Revision to comments in OP | ray_burnimage | 12 hours ago | |
| Re: Revision to comments in OP | mosswings | 11 hours ago | |
| Demonstration of why Z8 hunts in low-light | Horshack | 17 hours ago | 5 |
| Re: Demonstration of why Z8 hunts in low-light | Dinosaur dave | 16 hours ago | |
| Re: Demonstration of why Z8 hunts in low-light | Horshack | 16 hours ago | |
| Re: Demonstration of why Z8 hunts in low-light | Dinosaur dave | 16 hours ago | 1 |
| Re: Demonstration of why Z8 hunts in low-light | HRS | 16 hours ago | 1 |
| Re: Demonstration of why Z8 hunts in low-light | Horshack | 16 hours ago | 1 |
| Re: Demonstration of why Z8 hunts in low-light | CliveTJ | 15 hours ago | |
| Re: Demonstration of why Z8 hunts in low-light | Donmonte | 15 hours ago | |
| Re: Demonstration of why Z8 hunts in low-light | Horshack | 13 hours ago | 2 |
| Re: Demonstration of why Z8 hunts in low-light | ray_burnimage | 15 hours ago | 3 |
| Re: Demonstration of why Z8 hunts in low-light | Horshack | 15 hours ago | 2 |
| Re: Demonstration of why Z8 hunts in low-light | ray_burnimage | 15 hours ago | 1 |
| Re: Demonstration of why Z8 hunts in low-light | Tord Carlsson | 12 hours ago | 1 |
| Re: Demonstration of why Z8 hunts in low-light | Floodblue | 15 hours ago | |
| Re: Demonstration of why Z8 hunts in low-light | HRS | 14 hours ago | 1 |
| Re: Demonstration of why Z8 hunts in low-light | SCoombs | 16 hours ago | |
| Re: Demonstration of why Z8 hunts in low-light | Horshack | 16 hours ago | |
| Maybe stopped-down-aperture focusing explains "Eyelash"AF? | HRS | 9 hours ago | |
| Re: Maybe stopped-down-aperture focusing explains "Eyelash"AF? | mosswings | 8 hours ago | |
| Re: Maybe stopped-down-aperture focusing explains "Eyelash"AF? | Dinosaur dave | 4 hours ago |
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